`mail.opensource-book.com`

DNSSEC	⚠️ Not signed
A	85.13.134.57^{🇩🇪 NMM-AS85.13.134.0/24 Neue Medien Muennich}
		PTR	`dd21412.kasserver.com`

`opensource-book.com`

	DNSSEC	⚠️ Not signed
	A	85.13.134.57^{🇩🇪 NMM-AS85.13.134.0/24 Neue Medien Muennich}
	NS	`ns5.kasserver.com` ⭐
	NS	`ns6.kasserver.com`
	MX	`w00b0c0c.kasserver.com` ⭐
	TXT	`v=spf1 a mx include:spf.kasserver.com ~all`
	SOA	`ns5.kasserver.com`hostmaster@kasserver.com serial=2602221239

Previously MX for

opensource-book.com

Same first word

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DNS History

3 records (1 active, 2 former)

○A85.13.129.1022016-01-25 → 2016-04-23 · 5 obs

○ 2015-11-05 06:41:50
● 2016-01-25 12:39:18
● 2016-04-23 00:25:24
○ 2026-03-09 23:57:28
○ 2026-03-25 09:31:30

●A85.13.134.572026-03-09 → 2026-03-25 · 3 obs

○ 2016-04-23 00:25:24
● 2026-03-09 23:57:28
● 2026-03-25 09:31:30

○A85.13.136.42015-06-08 → 2015-11-05 · 4 obs

● 2015-06-08 02:33:48
● 2015-11-05 06:41:50
○ 2016-01-25 12:39:18
○ 2026-03-25 09:31:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	j.gtld-servers.net, m.gtld-servers.net, d.gtld-servers.net, k.gtld-servers.net...	-
opensource-book.com	ns5.kasserver.com, ns6.kasserver.com	2 records

✅ Authoritative Response

Server:85.13.128.3

NS records: ns5.kasserver.com, ns6.kasserver.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opensource-book.com (unsigned zone)

⏱️ Timing

Total: 260ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`85.13.134.57`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns5.kasserver.com, ns6.kasserver.com)

Analysis

IP Addresses

mail.opensource-book.com points to a single IP number: 85.13.134.57.

Other host names, for instance celloon.com, w00f8ea2.kasserver.com, go2pepper.at, opensource-book.com and alt-karin.de share IP numbers with mail.opensource-book.com.

mail.opensource-book.com - robtex.com